Control for automatically reversing the carriage feed of a lathe



Sept. 12, 1950 e. L. COFFEY CONTROL FOR AUTOMATICALLY REVERSING THE CARRIAGE manor A LATHE 2 Sheets-Sheet 1 Filed Qct. 22, 1946 Q s o IRWQN o NN um. I I

9w HHHP HAIQ Kw m Sept 12, 1950 a. L. COFFEY CONTROL FOR AUTOMATICALLY REVERSING THE CARRIAGE FEED OF A LATHE 2 Sheets-Sheet 2 Filed 001;. 22, 1946 MIME/V7019 6'. L (OF/-27 ArrmA/ir Patented Sept. 12, 1950 CONTROL Fon AUTOMATICALLY, :REVERS- mo THE CARRIAGE FEED OF A LATHE George L. CoffeyQChicago, Ill., assign or toWestev v ern Electric Company, Incorporated, New N. Y a corporation of New York -Application October 22, 1946, Serial 704.913

' (o1.s2-2 1 I This.invention relatesto a control for automaticallyreversing thecarriage feedof-a lathe and more particularlytoa control for automati-v cally reversing the carriage feed of a lathe used dri'veand the direc ion York,

riage.

A more complete understanding of the mien-i of movement-{cf the car:

tion may be had by reference to the following in cuttingdistributing screws. 5 detailed descriptionandthe accompanyingdraw; In the cutting or distributing. screws, in one ,ings illustrating. a preferred embodiment of the method. as heretofore practiced, the power. drive invention in=which: r 1 A A: forsrotating the workand for advancing the c-a r, Fig. 1 isa somewhat diagrammatic plan view, riage and the cutting toolthereonis disconnected: of a conventional lathe set up to cut a distribut to stop the'drivel when the cutting tool reaches 1 ing screwand having a onventional driveand a point just short of the ends of the reversing a shiftable control rodfor-efiecting the reversal" threads being cut-in thewwork. The operator, of the; drive and showing-the devices thereon for: then, by engaging-the chuck, manually actuates. automatically shifting the control rod;-' 1 the drive to feed the tool at a slow fcontr lled F'g z :is anenlarged fragmentary elevational' rate to the end .of the-screwthread beingcut view ofadistributingscrew;Q; and.to stoputhetoolat the precise point where, r Fig. 3 is an enlarged perspectiveview showing} theztool and thecarriage should ,be reversed. He. one of the shitting devices and a perma ence; then actuates a reversing lever which, througha; associated lathe; t control rod, conditions the drive reversing mecha- Fig. .i is an enlarged fragmentary plan'view o f' nism to drive the carriagein a reverse direction the lathe showing vthe shifting devices thereon; when. the automatic drive is .again started. and p It, is an object .of the presentinvention to pro Fig.v 5 is' a side elevational view of; the mecha vide a mechanism for automaticallyand instantly nism shown in Fig. 4 withparts broken away] actuating the, reversible drive of -a lathe to effect Referring to' Fig 1 ofIth'e' drawings, there is instantreversalqof the movement of thecarriage illustrated .in somewhat diagrarnmaticjform a atra predetermined point in itstravel V conventional lathe l5 setup to cut areversin'gi In one embodiment of the invention, a-lathe thread It (Fig. 2) of a distrihutors'crewina'rod set upforcutting .distributingscrews and which H. The rod. IT, in which'the thread lfi is to be has a reciprocable carriage and .a, drive therecut, is mounted for rotation in a chuck "l9 'anda for reversible under controlv of a shiftable contail stock spindle [20, the former of] which is ro' trol rod, is provided with a pair of control rod tated in a well-known manner by ,a conventional shifting devices adjust-ably mounted on the lathe lathe drive (not shown). A tool 22 is clamped. imthe; path-pf movement of thecarriage and ,on in aftool rest 23. mounted for transverse move? opposite; sides tl' ereof for instantl shifting the ment on the carriage 24, which is'longitudinally' control .;rogi;in ;opposite directions under control slidable onways 25,- 26 of the lathe 1 51 Thec'ar; of th e garriage t a t ate the drivereversing 3 riage 24 is moved longitu'dinallyf,on the' lathe inf mec anism-and efiect. rever a o mo n 0 o qsi er l de z ai the carriage. -Theshiftingdevices'comprisepiv conventional driving connectionjtherewith and t -oted arr n s, which arespring-stressed in opposite which" drive] synchronized with that of the direction and engagealole.;.with collars ,on the chuck 19-; through a conventional, gearing and control rod for shiftingthe rod alternately in op: 40 reversing mechanisint'notshown), The conven'-' posite directions and the arms are retracted altional'drive'reversing mechanism (riotshownifis ternately-to. asst. position during the reverse actuated to.reverse the drive in response ,toa travel for the carriage .by members attached longitudinal movement of afc ontrol. rod 131]; ex.- thereto and the arms are. held in the 'set p a; tending. longitudinally of the lathe softhatwhen ti n by latches whichare'trippedalternately by {15 the control rod 3ll'is' jmoved.'in'onefdirectien, the" the carriage attheendof apredeterminedmove lead screw "Z'l is" caused; to'rotate [to -move hernent rthereoflinopposite directions to release the carriage in one. direction and when the cojr ltrQ1; spring stressed arms which' instantly; shift'the' ro'd30 is'm-oved in' theopposite/direction;the; 'adf control rod alternately in oppositefdirec'tion's and screw 21' is caus'ed to rotateand move thecafi mus"ustanuyesecrsrne reversaliof the carriage riage in the reverse direction.. H

and 35 are provided The cohtrol= ro.cl shifting devices 33""and 3'8 areadjustablfi mounted on "theiathe way in the path of movement of the barria'ge 24 and on opposite sides thereof and are I actuated by the carriage at the-cachet its grede-l termined movement in olipofiihqflil fifimll Q2?" cause the devices 33 and 3 3 a the control rod and one carriage feed.

Each control rod shiftingdevice compris' ment against the Way 2* by a pair of bolts 40.

An -a'nn 'n of thebracket extenss laterany from:

the lathe and is provided with a boss 42 for receive ingfia "vertical headed pin- 'or tews-3; on which ana'ctiiating arm or leve' H is pivotally mounted; ori am -trams arm- 4 s slottedt-as at BEE-to receiiie the controlrod wane is? adapted-to engage t1 and awe othereiid'ftothe {Mi-stresses the arm rm rocking movement {in one direction {about the vertical pin' wene-causes ie e engage the cellar 41 and' shitt? the qontrol rod fl mete-"anesth sf The arm 44 is adabtejd to be moved in the reverse direction during the; reverse movement or thejcarriage'jthron'gha*connectormember EB 'carri'ed thereby.- The embodiment illustrated herein of the connector member comprises" a 'fieXib1e abled [J ne i d iwh as es l u i 52th" the aim M anclds secured td'an enlargedknob 5 for engaging the arm M and the other end fthe' gable 5ij is secured t'oja threadedflrod 55 sh pe racket m nted 1 e arr e.

engages an arm 61 forming a part of thelatc n' Tned race 6815 w ed bn n'eendff b latch m m r in Per i th la h to' be damm d line w rd by v he m mb r '3? of e rm 4: a .v th

member? 63, passes thereunder into. latqhinggen} gaeementyw t he la ch 60, Aitripmember' 1.0,, adii1$tab1Y m unt d 0n he. k t 5 161? the Ca l:

ria ge, 24, is aligned with the, arm G'Ifi the :latcl} 60 and is adapted toengageth 'a f 61 andtrip he la a a ed t minetl omt o th 'ei me l o th rr e to, 'I LeQSeI'Q PIi E biased arm, which, iristantly.shifts, the control a rod 30 to efiect the 'instantreversal crane ear riage drive and the reversal of movement of the carriage.

It will be understood that the structure of the devices 33 and 34, though similar, are reversed I with respect to each other, one being righthanded and designed to instantly shift the control rod in one direction, and the other left-handed nient and is positioned opposite the point 32 of the reversing deed screw thread It. The device 'ii i's th en clamped iii approximate adjusted position on the lathe and the trip member 10 cooperati'rig therewitlr' is accurately adjusted on the [bracket-fife the carriage to trip the latch and "release'thelever 44 when the carriage, in its movebracket 31 (Fig. 3) recessed atifiitoto fieceitteitheiw j. lathe way 25 and be clamped thereto by means of a clamping plate 39 drawn into clamping engagemeat/,-reaches thig goint. The collar 41 on the control, rod 30 is secured in adjusted position adj achtthearm 44 so that when the arm M is released, it will engage the collar and shift the rod- The carriage maythentbemoved ma reverse direction soi'nthatsxthez' tooled-2 tcaniedvthereby lsl at the oth'er: end of-uits tIBNEIPB-Hds :l'oicated"dimectly v opposite the point 3 l of thereversing thread t6 be cut in the rod Ilmrwithzthe;carriagez in:thisi position, the zdevicefiximaymev clamped onto the lathe in approxirnateradjustediqaosition and1tha. tripmember.:lfiicooperating therewithis: adjusted to ti ip the=1atch '60 andicrel'easei the :actuating arm' 44 at this pointiin'themovement orthe carriages The coi-lar 6liassociatedswitlrithe. devi'ce 33t is also; secured-in adjnste'd'iposition Jon the rod While the carriage'i is this position; the lscennecting memb'er'ifl associate with; th n-device Miis ad-i ju'sted-to-a positiom-where-iit retracts the armxfl; to-its set or-biased rsositionmvherezitiwill be mains tained'by the later-'1 60; The carriagecmayethen be moved to the :end of its travel in: the opposite' wrighthand direction and the connecting ber- 53' asso'ciated wi'th the :device' 33- is adjusted to retract the actuating arrnffl oi the devicez33 to its set or 'biased position;xwhereiti'is'latchedizby With the devices '33 and 34 'proper1y adjusted; the automatic lathe drive may beconnectd sand the tool rest advanced td r nove the tool 22 into cuttingengagement with the -rodti H. Asirthe carriage approaches the} end otl its movement-l te the-right; as viewed in- Fi 1, the-arm :44 of the device 33 15 reset m tts atchd bositipn"bythe connector-*memberilill associated/therewith and when "the carriagey has reached the 1 end of its movementfithe tr-ip member l-llcarried thereby and assoeiated -with the shifting device 34 will tripthe latch" 60 or} the *de'viee 34"aii release th'e sprin d sjeeacmatmg arm M, w-l-iich 'instant ly shifts-the 'control rodm toithe right to reverse the carriage and' -i'nove the *parria'ge to the left. As thecarriage approaches th'eiend ot its,

movement {in the ifeverse direction "or to the left;

the samecycle or dperation isr'epeated'tq reverse 1. In a lathe-havinga reciprocable carriage and adrivetherefor reversible under control of I an axially shiftable control-rod, an actuating member movable relative to said rod for moving said rod" axially in "onedirection, means ror stressing said actuating member for movement in said one direction, means operable in response to the reverse movement of said carriage for moving the actuating member axially in a reverse direction to a set position, latch means releasably engageable with said actuating member for holding said member in the set position, and means forming part of said carriage for actuating said latch at a predetermined point in the movement thereof to release said actuating member whereby said member instantly shifts said control rod to effect the reversal of the carriage drive.

2. In a lathe having a reciprocable carriage and a drive therefor reversible under control of an axially shiftable control rod, an actuating member movable relative to and engageable with said rod for moving said rod axially in one direction, spring means for stressing the actuating member for movement in said one direction, means connected to the carriage and operable in response to the reverse movement thereof for moving said actuating member in a reverse direction to a set position to load said spring means,

latch means for holding the actuating member in said set position, and means movable with the carriage for tripping the latch means at a predetermined point in the movement of said carriage whereby said actuating member is released to instantly shift said control rod to effect a reversal of the carriage drive.

3. In a lathe having a reciprocable carriage and a drive therefor reversible under control of an axially shiftable control rod, a pair of actuating means adjustably secured to the lathe on opposite sides of the carriage and including a pair of members stressed for movement in opposite directions to move said control rod axially in opposite directions, means connected to the carriage for retracting said members alternately to set positions, latch means releasably engageable with said members for holding said actuating means in said set positions, and means movable with the carriage for alternately actuating said latch means at predetermined points in the reverse movements of the carriage alternately to efiect the release of the actuating means and cause an instant shifting of said control rod alternately in reverse direction to effect the instant reversal of said carriage drive.

4. In a lathe having a reciprocable carriage and a drive therefor reversible under control of an axially shiftable control rod, pair of actuating members movable relative to said rod and stressed in opposite directions to move said rod axially in opposite directions, means connected to and movable with the carriage for retracting said actuating members alternately to set positions, latch means for holding said actuating members in said setpositions, and means [connected to and movable with the carriage for alternately tripping the latch members at predetermined points in the movement in opposite tions to reverse thecarriage'drivew 5. In a'l lathe having: a; reciprocable carriage, and 1 a I drive therefor" reversible under control of a 'sli-iftable' control rod -a control mechanismifor shifting "said controlrodin opposite directionslin response to' a predetermined movement ofx-the carriage in I opposite directions comprising: a pair of brackets-:adju'stably secured on said latheeon opposite sides o'f said carriage, ipivoted :armson said -bra'ckets?: engageable withsaid :rod: ifor=.shifting said rod alternately in opposite directions, spring means associated with said arms for stressing said arms in opposite directions, members movable with said carriage for alternately moving said pivoted arms to set positions in directions opposite to that imparted thereto by the spring means, latches on said brackets for holding said arms in said set positions, and means forming part of said carriage for alternately actuating said latches at predetermined points in its reverse movements to release the arms which instantly'shift the control rod alternately in opposite directions to effect the instant reversal of the carriage rod.

6, A lathe controlling apparatus for use with a lathe which has ways, a carriage movable on the ways anda control rod for controlling the direction of movement of the carriage on the ways comprising a bracket, means for clamping the bracket on one of said ways in adjusted position relative to said rod, a spring actuated arm pivotally mounted on said bracket for shifting said control rod, a latch mounted on said bracket for holding said arm in inoperative position, a

, trip member movable with said carriage for tripping said latch to release the spring actuated arm, means for attaching said trip member to said carriage, and means for adjusting said trip member relative to said carriage.

'7. In a lathe having a reciprocable carriage and a drive therefor reversible under control of a shiitable control rod, a control mechanism for shifting said control rod in opposite directions in ing said arms in said set positions, means forming part of said carriage for alternately actuating said latches at predetermined points in its reverse 'movements to release the arms which instantly respect to the carriage to determine the position of reset of said pivoted arms.

8. In a lathe having a reciprocable carriage and a drive therefor reversible under control of an axially shiftable control rod, a control mechanism for shifting said control rod in opposite directions in response to a predetermined movement of the carriage in opposite directions comprising a pair-of brackets adiustably secured on 

